William



UNITED STATES PATENT OFFICE.

\VILLIAMJOY, OF NORTHFLEET, ASSIGNOR TO HENRY PETERS, OF

' WOULDHAM, ENGLAND.

' METHOD OF FEEDING CEMENT-KILNS.

SPECIFICATION forming part of Letters Patent No. 434,830, dated August 19,1890.

Application filed December 2'7, 1888.

To all whom it may concern.-

Be it known that I, WILLIAM JOY, of N orthfieet, England, a subject of the Queen of Great Britain, have invented certain new and useful Improvements in the Method of Feeding or Charging Cement-Kilns, of which the following is a specification.

Myinvention consists of the improvements hereinafter described in the method of feeding cement-kilns when partly charged and while the portion of the charge therein is burning; and my said improvements consist in so feeding the kiln partly with a mixture of slurry and fuel and partly with slurry unmixed with fuel.

In order to prepare for the carrying out of my invention I prefer to start the kiln as follows: I partly charge the lower part of the kiln by placing a layer of bavins' or fagots on the fire-bars and on this a layer of coke about eight inches deep, and on the coke a layer of slurry and fuel in admixture of about the same depth, the-mixture being either wet or dry, and I then ignite the bavins or fa ots, and when the fire begins to break through the upper part of the charge I feed the kiln as described in the specification of Letters Patent of the United States of America granted to me, No. 331,243-that is to say, I throw wet slurry mixed with small coal or coke-breeze or other suitable fuel onto that part or those parts of the charge where the tire is breaking through; or I throw quantities of dried or partially dried slurry and quantities of coke-breeze or other suitable fuel in powder or small pieces separately onto the said parts of the charge. In either case, after throwing on a sufficient quantity to partially check the draft at the said part or parts, I discontinue feeding the kiln until the fire again breaks through at the same or at another part or other parts of the surface of the charge, when I repeat the operation, and I continue feeding the kiln in this manner until the lower portion of the charge is by the action of the heat converted into a clinker or mass of uniform density or compactness, The formation of clinker in the lower part of the charge ordinarily takes place by the time the quantity of matter in the kiln, when fed Serial No, 294,818. (No specimens.)

as hereinbefore described, is two or three feet in depth; but the condition of the said part of the charge may be ascertained by its appearance when viewed through the spaces between the fire-bars, or by driving an iron rod down into the charge, the passage of which rod is very forcibly resisted when it comes into contact with a portion of the charge which has been converted into clinker. When the burning charge has been brought to this condition,I proceed with the further feeding of the kiln accordingto mypresent invention that is to say,I further feed the kiln partly with a mixture of slurry and fuel and partly with neat slurry, (t. a, slurry unmixed with fuel.) The manner inwhich I prefer to charge the said matters into the kiln and the proportions in which I prefer to use the mixture of slurry and fuel and the neat slurry in thus feeding the kiln are hereinafter particularly described. As soon as the fire rises near enough to the surface at any part or parts of the charge to cause a dull red glow to appear at such part or parts I throw thereon, by means of a shovel or otherwise, a quantity of either the mixture or neat slurry sufficient to obscure the said glow, taking care to distribute the said matter as evenly and equally as possible over the said part or parts, and I continue thus feeding the kiln with either the mixture or the neat slurry by depositing a sufficient quantity on any part or parts where from time to time the dull red glow appears. Where the said glow reappears at a part or parts where the mixture has been thus deposited, I deposit neat slurry thereon, and where the said glow reappears at a part or parts where neat slurry has been deposited, as hereinbefore described, I deposit a quantity of the mixture thereon. In this way I proceed until the kiln is full; but as the heat in the kiln increases as the mass of burning charge increases I use a less quantity of the mixture in proportion to the neat slurry as the charge accumulates than at starting. Thus on starting the feeding of the kiln according to my present invention I use the mixture and the neat slurryin the proportions of about three parts, bybulk, of the former and one part, by bulk, of thelatter, and after feeding with these proportions for about six or eight hours I use the mixture and the neat slurry in the proportions of about two parts, by bulk, of the former and one part, by bulk, of the latter, and after feeding with these proportions for about the same length of time I use the mix ture and the neat slurry in about equal proportions by bulk, and after feeding with these proportions fora further period of six or eight hours I use the mixture and the neat slurry in the proportion of about two parts, bybulk, of the former to three parts, by bulk, of the latter.

If at any time during the operation of feeding the kiln according to my present invention the burning of the charge should proceed irregularly-that is, if the fire break through the surface at any part, or if at any time the feedingshould be delayed until the upperlayersof the chargebeburned through the feeding with neat slurry must be discontinued until the charge has been again brought to the condition of a compact and uniformly-burning mass, which effect may be produced by feeding the kiln for a time solely with a mixture of slurry and fuel, as described in the specification of my aforesaid patent, No. 331,243. The fuel for mixing with the slurry may be either coke-breeze or small coal or dust-coal. The proportions of the slurry and the fuel in the mixture of slurry and fuel may be equal where coke-breeze is used. Where small coal or dust-coal is used, the proportions of slurry and fuel in the mixture may be five of the former to four of the latter.

Both the mixture and the neat slurry may be fed into the kiln in a wet or moist or dry or partially dried state; or the mixture may be wet or moist and the neat slurry dry or partially dried; or the mixture may be dry or partially dried andthe neat slurrywetormoist. \Vhere I use the mixture or the slurryor both in a wet state, Iprefer that they shall not be liquid, or so Wet that they cannot readily be thrown into the kiln by means of a shovel with suflicient precision to cause the portions so thrown in to be lodged where required, in order that the several layers may be of sufliciently even or uniform depth or thickness.

In feedinga kiln as hereinbefore described I throw the matters into it through the loading-eye or opening in the dome or conical roof thereof. \Vhen a kiln has been fully or suliiciently charged by feeding it, as hereinbefore described, the charge may be allowed to burn out and be then drawn and the kiln restarted and again fed, as hereinbefore described; or after the kiln hasbeen fully or sufficiently charged, as hereinbefore described, a portion of the burned charge may be drawn from the lower part and the feeding, as hereinbefore described, then resumed, the kiln being thus worked continuously.

Instead of charging the lower part of the kiln, as hereinbefore described, preparatory to starting, it may be charged to a sufficient depth in the ordinary way or in any other convenient way.

I wish it to be understood that I make no claim to the use, per se, of a mixture of slurry and fuel in the feeding or loading or chargin g of cement-kilns, and that I make no claim to the use of neat slurry in the said operation otherwise than in conjunction with the use of a mixture of slurry and fuel; and I further wish it to be understood that although Ihavc described in detail the manner in which I prefer to operate in carrying out my said invention, yet my claim, which is hereinafter stated, is not restricted to the loading or feedingorchargingof cement-kilnsprecisel y in the manner I have described, as the details of the operation hereinbefore described may be considerably varied without departing from the nature of my said invention.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- 1. The improvement herein described in the manufacture of cement, which consistsin separately depositing at different times quantities of a mixture of slurry and fuel and quantities of neat slurry on the burning mass in a partly-charged cement-kiln as the burning proceeds, substantially as set forth.

2. In the manufacture of cement, the improvement herein described of feeding the cement-kiln, which consists in depositing neat slurry and slurry and fuel in admixture on the burning charge as the burning progresses, substantially as set forth.

WILLIAM JOY.

Witnesses:

ALFRED DONNISON, J OHN A. DONNISON,

Both of No. 71, Oornhill, London. 

